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https://issues.apache.org/jira/browse/CALCITE-2848?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltan Haindrich updated CALCITE-2848:
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Summary: Simplifying a case statement's first branch should ignore its
safety (was: Simplifying a case statement's first branch should disregard its
safety)
> Simplifying a case statement's first branch should ignore its safety
> --------------------------------------------------------------------
>
> Key: CALCITE-2848
> URL: https://issues.apache.org/jira/browse/CALCITE-2848
> Project: Calcite
> Issue Type: Improvement
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
>
> Example: a very simple CASE which is not get rewritten because the first
> condition branch contains an unknown UDF
> {code:sql}
> CASE
> WHEN to_date('2001-11-11') = '2000' THEN true
> ELSE false
> END
> {code}
> This expression right now retained as is; because the "to_date" was an
> unknown UDF; but since the first branch of a CASE is always evaluated and
> that could unlock the rewrite of this case to it's boolean form.
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